Non-Uniqueness Dilemma in the Kahramanmaras Tsunami Source Solutions at Different Frequencies: Hint for Excitation by Transient Rayleigh Waves From a Strike-Slip Rupture
The 2023 Kahramanmaras earthquakes created a small tsunami in the northeastern Mediterranean Sea with amplitudes reaching ~30 cm near the Iskenderun Bay. Simulation of a large number of tsunami scenarios with tectonic and geomechanic sources designed using attenuation models reveal the possibility of a seismicall triggered submarine landslide matching the moderate domonant frequency observed in the records from local tide gauges. However a long-period, emerging precursor to the landslide tsunami signal in tide gauges records close to the Iskenderun Bay points to an 'indirect', near-field contribution of Rayleigh waves in shallow water as shown by numerical simulations. This observation is noteworthy, especially considering the surface deformation lobes pointing 'away' from the sea, in a region otherwise considered to be a "safe zone". This result, along with former observations in the case of recent tsunamis urges the re-evaluation of existing tsunami hazard assessments in coastal regions at or close to strike-slip faulting.
Session: February 2023 Mw 7.8 Earthquake Sequence in Turkey
Type: Oral
Room: 201 A/B
Date: 4/19/2023
Presentation Time: 11:30 AM (local time)
Presenting Author: Amir Salaree
Student Presenter: No
Additional Authors
Amir Salaree Presenting Author Corresponding Author salaree@umich.edu University of Michigan |
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Non-Uniqueness Dilemma in the Kahramanmaras Tsunami Source Solutions at Different Frequencies: Hint for Excitation by Transient Rayleigh Waves From a Strike-Slip Rupture
Category
February 2023 Mw 7.8 Earthquake Sequence in Turkey
Description